Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Derivative interest rate cap payment received or accrued from counter parties.

+ References

No definition available.

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- Definition

Line of credit facility expiration year and month.

+ References

No definition available.

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- Definition

Line of credit increase in borrowing capacity.

+ References

No definition available.

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- Definition

Margin on base rate.

+ References

No definition available.

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- Definition

Mortgage debt.

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No definition available.

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- Definition

Number of extension options.

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No definition available.

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- Definition

Premiums paid for derivatives.

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No definition available.

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Data Type:	xbrli:monetaryItemType
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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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No definition available.

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

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No definition available.

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
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-SubTopic 10
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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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Balance Type:	credit
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- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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No definition available.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Debt and Financial Instruments - Additional Information (Detail)		3 Months Ended			12 Months Ended	33 Months Ended	36 Months Ended
	Mar. 27, 2018 USD ($) Option	Mar. 31, 2019 USD ($)	Sep. 30, 2016 USD ($) Derivative	Jun. 30, 2016 USD ($) Derivative	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings under revolving credit agreement		$ 200,300,000			$ 196,400,000	$ 200,300,000	$ 200,300,000
Available borrowing capacity		99,700,000			103,600,000	99,700,000	99,700,000
Interest Rate Cap
Debt Instrument [Line Items]
Number of interest rate cap agreements \| Derivative			1	1
Notional amount		$ 60,000,000	$ 30,000,000	$ 30,000,000		60,000,000	60,000,000
Premium paid			$ 55,000	$ 115,000
Expiration date of interest rate cap		Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2019
Derivative interest rate cap, payment received or accrued from counterparties		$ 61,000			144,000	205,000	205,000
Level 2
Debt Instrument [Line Items]
Mortgage loan fair value		65,800,000			64,900,000	65,800,000	65,800,000
Mortgage debt					$ 65,300,000
LIBOR \| Interest Rate Cap
Debt Instrument [Line Items]
Derivative instruments, LIBOR rate			1.50%	1.50%
Credit Agreement
Debt Instrument [Line Items]
Outstanding borrowing	$ 300,000,000	$ 300,000,000				$ 300,000,000	$ 300,000,000
Increase in borrowing capacity	$ 50,000,000
Unsecured revolving amended credit agreement terminated date	2022-03
Number of additional six month extension options \| Option	2
Proceeds from Lines of Credit	$ 50,000,000
Credit facility, Interest Rate Terms		one, two, three, or six month LIBOR plus an applicable margin ranging from 1.10% to 1.35% or at the Base Rate plus an applicable margin ranging from 0.10% to 0.35%.
Base rate description		the greater of: (a) the administrative agent’s prime rate; (b) the federal funds effective rate plus 1/2 of 1%, and; (c) one month LIBOR plus 1%.
Facility fee payable on commitment		0.20%
Credit Agreement \| LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate		1.20%
Credit Agreement \| Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate		0.20%
Credit Agreement \| Swingline/Short-Term Loans
Debt Instrument [Line Items]
Outstanding borrowing	30,000,000
Credit Agreement \| Letters of Credit
Debt Instrument [Line Items]
Outstanding borrowing	$ 40,000,000
Credit Agreement \| Minimum
Debt Instrument [Line Items]
Facility fee payable on commitment	0.15%
Credit Agreement \| Minimum \| LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate	1.10%
Margin points added to the base rate	1.00%
Credit Agreement \| Minimum \| Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate	0.10%
Credit Agreement \| Minimum \| Federal Funds Effective Rate
Debt Instrument [Line Items]
Margin points added to the base rate	0.50%
Credit Agreement \| Maximum
Debt Instrument [Line Items]
Facility fee payable on commitment	0.35%
Credit Agreement \| Maximum \| LIBOR
Debt Instrument [Line Items]
Margin points added to the reference rate	1.35%
Credit Agreement \| Maximum \| Base Rate
Debt Instrument [Line Items]
Margin points added to the reference rate	0.35%